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<script type="text/javascript">
//<!--
    function showErrorInfo(text, pos) {
      alert("Error:\r\n" + text + "\r\nPosition in source: " + pos);
    }

    function cstr_decode(input) {
        var output = "";
        var states = {
            OPENING: 0,
            STRING: 1,
            ESCAPING: 2
        };
        var state = states.OPENING;

        for (i = 0; i < input.length; i++) {
        
            switch (state) {
              
              case states.OPENING:
                switch (input[i]) {
                  case ' ':
                  case '\f':
                  case '\n':
                  case '\r':
                  case '\t':
                  case '\v':
                    break;;
                  case '\"':
                    state = states.STRING;
                    break;
                  default:
                    if (i != input.length - 1) {
                      showErrorInfo("Unexpected character (" + input[i] + "), expecting quotation mark", i);
                      return output;
                    } else {
                      showErrorInfo("Unexpected character (" + input[i] + "), conversion interrupted", i);                       
                      break;
                    }
                }
                break;
              
              case states.STRING:
                switch (input[i]) {
                  case '\f':
                  case '\n':
                  case '\r':
                  case '\t':
                    break;
                  case '\"':
                    state = states.OPENING;
                    break;
                  case '\\':
                    state = states.ESCAPING;
                    break;
                  default:
                    output += input[i];
                    break;
                }              
                break;
                
              case states.ESCAPING:
                switch (input[i]) {
                  case 'f':
                    output += '\f';
                    break;
                  case 'n':
                    output += '\n';
                    break;
                  case 'r':
                    output += '\r';
                    break;
                  case 't':
                    output += '\t';
                    break;
                  case '"':
                    output += '\"';
                    break;
                  case '\\':
                    output += '\\';
                    break;

                  default:
                    showErrorInfo("Unexpected character (" + input[i] + "), expecting one of the escaped character (f, n, r, t, \, or quotation)", i);
                    return output;
                }
                state = states.STRING;              
                break;
            }
                             
        }

        if (state != states.OPENING) {
          showErrorInfo("Source string not terminated correctly", i);          
        }
        return output;
    } 
    
    function Convert() {
        var output = cstr_decode(document.frmConvert.ed_input.value);
        document.frmConvert.ed_output.value = output;
    } 

//-->
</script>


<div id="main">
<h1>C/C++ string literal to text converter</h1>
	<p>Converting C-like string literal to text (unescaping).</p>
      <form name="frmConvert" action="">
				<p>C/C++/... string literal:</p>
			    <p><textarea name="ed_input" rows="10" cols="67" style="width: 550px;"></textarea></p>		  
			  <p>
			    <button type=button name="btnConvert"
            onclick="Convert()">
            Convert
          </button>
			  </p>
				<p>Unescaped text:</p>
			    <p>
            <textarea name="ed_output" rows="10" cols="67" style="width: 550px;"></textarea>          
          </p> 
			</form>
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